miniDSP DDRC-24 User manual

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DDRC-24
ULTRA-COMPACT 2-IN 4-OUT AUDIO PROCESSOR WITH
DIRAC LIVE® ROOM CORRECTION TECHNOLOGY
User Manual

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 2
Revision history
Revision
Description
Date
2.0
Updated for Dirac Live 2/3, DiracLive
documentation moved to separate miniDSP Dirac
Live User Manual.
30 June 2020
SUPPORTED OS
If you are unable to run the above versions of the Windows or macOS operating system,
you will need to use the original version of Dirac Live (“Dirac Live 1”) with your DDRC-24
processor. Please refer to the DDRC-24 User Manual Legacy Support version.
Note: Use of Dirac Live with macOS Mojave and Catalina requires some manual
workarounds, which are documented in this manual.

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CONTENTS
Contents.............................................................................................................................................................. 3
IMPORTANT INFORMATION................................................................................................................................ 5
1Product Overview......................................................................................................................................... 7
1.1 Typical Application ............................................................................................................................... 7
1.2 Dirac Live.............................................................................................................................................. 8
2Hardware connectivity.................................................................................................................................. 9
2.1 Digital input.......................................................................................................................................... 9
2.2 Analog inputs and outputs.................................................................................................................... 9
2.3 USB .................................................................................................................................................... 10
2.4 DC power ........................................................................................................................................... 10
3Software Installation .................................................................................................................................. 11
3.1 Windows 10 ....................................................................................................................................... 11
3.1.1 Download and install the DiracLive application ........................................................................... 11
3.1.2 Download the miniDSP software................................................................................................. 11
3.1.3 Install the miniDSP software ....................................................................................................... 12
3.2 macOS 10.14 Mojave and 10.15 Catalina............................................................................................ 13
3.2.1 Download and install the DiracLive application ........................................................................... 13
3.2.2 Download the miniDSP software................................................................................................. 13
3.2.3 Install the miniDSP software ....................................................................................................... 14
3.3 2x4 HD to DDRC-24 upgrade............................................................................................................... 15
4Configuring with the DDRC-24 Plugin.......................................................................................................... 16
4.1 Synchronizing with the processor ....................................................................................................... 17
4.2 Key features ....................................................................................................................................... 18
4.2.1 Master control............................................................................................................................ 18
4.2.2 Configuration/preset selection ................................................................................................... 19
4.2.3 Inputs ......................................................................................................................................... 19
4.2.4 Input selection............................................................................................................................ 19
4.2.5 Matrix mixer............................................................................................................................... 20
4.2.6 Outputs ...................................................................................................................................... 20
4.3 Configuring back-end processing........................................................................................................ 21
4.3.1 Signal flow.................................................................................................................................. 21
4.3.2 Configuration procedure............................................................................................................. 22
4.4 Plugin configuration guide.................................................................................................................. 23
4.4.1 Stereo room correction............................................................................................................... 23
4.4.2 Stereo room correction and subwoofer integration .................................................................... 24
4.4.3 Stereo room correction and stereo supporting woofers/FAST..................................................... 25
4.4.4 Stereo room correction and two-way active speaker .................................................................. 26

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5Dirac Live Calibration.................................................................................................................................. 27
6Infrared remote control.............................................................................................................................. 28
7USB Audio................................................................................................................................................... 29
7.1 Mac OS X............................................................................................................................................ 29
7.2 Windows............................................................................................................................................ 30
8Plugin Reference......................................................................................................................................... 31
8.1 Input channel status........................................................................................................................... 31
8.2 Routing .............................................................................................................................................. 31
8.3 Output channels................................................................................................................................. 32
8.3.1 Channel label.............................................................................................................................. 32
8.3.2 Level metering and gain adjustment ........................................................................................... 32
8.3.3 Parametric EQ............................................................................................................................. 33
8.3.4 Crossover.................................................................................................................................... 35
8.3.5 Compressor ................................................................................................................................ 37
8.3.6 Invert and mute.......................................................................................................................... 37
8.3.7 Time delay.................................................................................................................................. 38
8.4 Custom biquad programming ............................................................................................................. 38
8.4.1 What’s a “biquad? ...................................................................................................................... 38
8.4.2 Using custom biquad programming ............................................................................................ 39
8.4.3 Biquad design software............................................................................................................... 40
8.5 Working with configurations .............................................................................................................. 41
8.5.1 Online and offline mode ............................................................................................................. 41
8.5.2 Selecting a configuration ............................................................................................................ 41
8.5.3 Saving and loading configurations............................................................................................... 42
8.5.4 Relationship with Dirac Live ........................................................................................................ 42
8.5.5 Restoring to defaults................................................................................................................... 43
8.6 Keyboard shortcuts ............................................................................................................................ 43
9Additional Information ............................................................................................................................... 44
9.1 Specifications ..................................................................................................................................... 44
9.2 Trouble-shooting playback issues ....................................................................................................... 45
9.3 Firmware upgrade.............................................................................................................................. 46
9.3.1 Windows .................................................................................................................................... 46
9.3.2 macOS / OS X.............................................................................................................................. 48
9.4 Obtaining support .............................................................................................................................. 50

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IMPORTANT INFORMATION
Please read the following information before use. In case of any questions, please contact miniDSP via the
support portal at support.minidsp.com.
System Requirements
To configure the miniDSP audio processor, you will require a Windows PC or Apple Mac OS X computer with the
following minimum specification:
Windows
•Microsoft• ® Windows® 10, latest version with all updates
•Intel Pentium III or later, AMD Athlon XP or later
•2 Gigabytes (GB) of RAM or higher
•Keyboard and mouse or compatible pointing device
•Two free USB 2.0 ports
Mac OS X
•macOS 10.14 Mojave or 10.15 Catalina, latest version with all updates
•Intel-based Mac with 1 GHz or higher processor clock speed
•2 Gigabytes (GB) of RAM or higher
•Keyboard and mouse or compatible pointing device
•Two free USB 2.0 ports
Disclaimer/Warning
miniDSP cannot be held responsible for any damage that may result from the improper use of this product or
incorrect configuration of its settings. As with any other product, we recommend that you carefully read this
manual and other technical notes to ensure that you fully understand how to operate this product. The miniDSP
audio processor is a powerful tool, and misuse or misconfiguration, such as incorrectly set gains or excessive
boost, can produce signals that may damage your audio system.
As a general guideline, you should perform the initial configuration of the miniDSP audio processor before
enabling audio through any connected output device or amplification. Doing so will help ensure that the
software is correctly configured.
Finally, note that the miniDSP audio processor is a very flexible device, and many of the questions we receive at
the tech support department are already answered in this user manual and in the online application notes on
the miniDSP.com website. So please take the time to carefully read this user manual and the online technical
support. Thanks for your understanding!
Warranty Terms
miniDSP Ltd warrants this product to be free from defects in materials and workmanship for a period of one
year from the invoice date. Our warranty does not cover failure of the product due to incorrect connection or

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installation, improper or undocumented use, unauthorized servicing, modification or alteration of the unit in any
way, or any usage outside of that recommended in this manual. If in doubt, contact miniDSP prior to use.
FCC Class B Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
•This device may not cause harmful interference.
•This device must accept any interference received, including interference that may cause undesired
operation.
Warning: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful interference to radio
or television reception, which can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•Consult the dealer or an experienced radio/TV technician for help.
Notice: Shielded interface cable must be used in order to comply with emission limits.
Notice: Changes or modification not expressly approved by the party responsible for compliance could void the
user’s authority to operate the equipment.
CE Mark Statement
The DDRC-24 has passed the test performed according to European Standard EN 55022 Class B.
A note on this manual
This User Manual is designed for reading in
both print and on the computer. If printing
the manual, please print double-sided. The
embedded page size is 8 ½” x 11”. Printing
on A4 paper will result in a slightly reduced
size.
For reading on the computer, we have
included hyperlinked cross-references
throughout the manual. In addition, a table
of contents is embedded in the PDF file.
Use the View menu (Preview on Mac) or
the bookmarks sidebar (Adobe reader on
Mac and Windows) to view this table of
contents.

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1PRODUCT OVERVIEW
Thank you for purchasing a miniDSP DDRC-24 audio processor powered by Dirac Live®, the world’s premier
room correction solution. We are delighted to offer you this extremely compact yet powerful software and
hardware combination, the fruit of extensive research and development and years of experience in sound
system tuning.
The miniDSP DDRC-24 offers not only a two-channel Dirac Live® room correction processor, but also an input-
output matrix mixer and a powerful set of DSP audio processing functions on each output channel. This allows
the DDRC-24 to be used for correction of a stereo signal, integration of one or two subwoofers, or to implement
a combined two-way crossover and room correction processor. Combined with its selection of analog, optical
digital, and asynchronous USB (up to 192 kHz) inputs, the miniDSP DDRC-24 offers an unprecedented level of
audio processing performance for its size and price bracket.
1.1 TYPICAL APPLICATION
In the typical application shown below, the miniDSP DDRC-24 acts as preamp and room correction/subwoofer
integration processor. Volume control is accomplished with a remote control by using the DDRC-24’s remote
learning feature.
Many other system configurations are possible with the miniDSP DDRC-24. See the Plugin configuration guide
(pages 21 to 26) for examples.

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1.2 DIRAC LIVE
The DDRC-24 processor executes Dirac Live® digital room correction, from Dirac Research. Dirac Live’s mixed-
phase filtering technology will improve the imaging of your system, minimize the effects of room modes and
resonances, and improve dynamics and clarity.
To accomplish its remarkable improvement in listening quality, the DiracLive application steps you through the
procedure for taking measurements around your listening area. Dirac Live® employs a sophisticated analysis
algorithm to make the optimal correction across the whole listening area, not just at a single point. The user has
full control over the target frequency response. Measurements are taken with a calibrated acoustic
measurement microphone, the miniDSP UMIK-1.
1
In addition to correcting magnitude response, Dirac Live® corrects the system’s impulse response, which reflects
how the system responds to a sharp transient such as a drumbeat. Reflections, diffraction, resonances,
misaligned drivers, and so on, all combine to smear out the transient. Correcting the impulse response makes
the speaker in the room behave much more like an ideal loudspeaker. The impulse response is a critical factor
for accurate sound-staging, clarity and bass reproduction.
Dirac Live calibration is described in the separate miniDSP Dirac Live User Manual.
1
We recommend that you add a UMIK-1 to your order if you do not already have one.

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2HARDWARE CONNECTIVITY
2.1 DIGITAL INPUT
Connect a single digital source to the optical (TOSLINK) connector. Thanks to its asynchronous sample rate
convertor (ASRC), all sample rates between 44.1 and 192 kHz are accepted.
Note: the digital input accepts only a stereo PCM digital signal. It does not accept encoded or multichannel
digital audio (such as Dolby Digital or DTS).
2.2 ANALOG INPUTS AND OUTPUTS
Connect an analog source or preamplifier to the RCA connectors on the front panel, and connect the four analog
outputs to power amplification or subwoofer(s). Be sure to take careful note of the channel numbering shown in
this diagram and on the rear panel.

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2.3 USB
Connect the USB (Type B mini) port of the DDRC-24 to a free USB 2.0 port of your computer using the supplied
cable. The USB connection is used for:
•Configuration with the DDRC-24 plugin and the DiracLive application, and
•Streaming audio from a computer or other device such as a music streamer, at up to 192 kHz.
2.4 DC POWER
The supplied 12 VDC power supply includes a set of interchangeable power pins (for USA, UK, Europe and
Australia). Fit the correct pins for your country. Connect the DC plug to the 12 VDC power socket.
Apply power to the processor only after all input and output connections have been made. The
processor uses very little power and so can be left powered on. If powered on and off, the following
sequence is always recommended:
•On: Power on line-level equipment, including the DDRC-24, then turn on power amplification.
•Off: Turn power amplification off, then power off line-level equipment, including the DDRC-24.

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3SOFTWARE INSTALLATION
The DDRC-24 is configured with software running on a PC or Mac. There are two sets of software to download
and install, from live.dirac.com and from miniDSP.com.
3.1 WINDOWS 10
This section describes software download and installation for Windows 10.
The software described in this section runs on the latest version of Windows 10 only. Other versions
of Windows are not supported by the current version of Dirac Live. If you are running an
unsupported version of Windows, refer to the DDRC-24 User Manual Legacy Support version.
3.1.1 Download and install the DiracLive application
Download the DiracLive application for Windows 10 from https://live.dirac.com/download/.
Double-click on the downloaded installer to run it. It will have a name like DiracLive v3.0.0 Setup Windows.exe.
We recommend that you accept the default installation settings. Do not run the application yet.
3.1.2 Download the miniDSP software
If you purchased your processor directly from miniDSP, your software will be available from the User Downloads
section of the miniDSP website when your order ships. To access the download, you will need to be logged into
the website with the account you created when purchasing.
If you purchased your processor from a miniDSP dealer, you will receive a coupon together with the product.
Redeem this coupon at the link below:
•https://www.minidsp.com/support/redeem-coupon
The User Downloads link is visible from the dropdown menu at the top right of the website:
Navigate to the Dirac Series section and then to DDRC-24 Software. Download the zip file under the heading
DDRC-24 software for Dirac 2.0.
After downloading, unzip the file (right-click and select “Extract All...”). The unzipped download has a name like
DDRC_24_v1_10_Dirac2. (The version number embedded in the folder name may be different.)

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3.1.3 Install the miniDSP software
3.1.3.1 Possible Windows installation issues
The miniDSP software requires that a number of other frameworks be installed for it to work. These packages
should be installed automatically, but you can manually install them if you receive an error message that
required software is missing.
•Microsoft .NET framework (version 3.5 or later)
•Latest version of Adobe Air
•Microsoft Visual C++ 2010 Redistributable Package: for x86 (32-bit Windows) or x64 (64-bit Windows).
3.1.3.2 Install the plugin
1. Navigate to the Plugins folder of the software download and then to the Windows folder.
2. Double-click on the plugin installer to run it. It will be named DDRC_24.exe. We recommend that you
accept the default installation settings.
3.1.3.3 Install the UAC2 driver
1. Connect the processor to the computer using the supplied USB cable, and power it on.
2. Navigate to the WinDrivers folder of the software download and double-click on the driver installer:
•miniDSP_UAC2_v4.67.0_2019-08-15_setup.exe
(The version number and date embedded in the filename may be different.)
We recommend accepting the default installation location. Once driver installation completes, click Finish.
Note: the first time you run the DDRC-24 plugin and the DiracLive application, you may see a Windows Firewall
warning such as the one below. Ensure that “Private networks...” is checked and “Public networks...” is not
checked. Then click on “Allow access.” This warning dialog may appear more than once.

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3.2 MACOS 10.14 MOJAVE AND 10.15 CATALINA
This section describes software download and installation for MacOS 10.14 Mojave and 10.15 Catalina.
This software described in this section runs on macOS 10.14 Mojave and 10.15 Catalina only. Other
versions of OS X / macOS are not supported by the current version of Dirac Live. If you are running an
unsupported version of OS X / macOS, refer to the DDRC-24 User Manual Legacy Support version.
3.2.1 Download and install the DiracLive application
Download the DiracLive application for macOS from https://live.dirac.com/download/.
Double-click on the downloaded file to unzip it. Then double-click on the unzipped installer file to run it. It will
have a name like DiracLive v3.0.0 Setup Darwin.app. We recommend that you accept the default installation
settings. Do not run the application yet.
3.2.2 Download the miniDSP software
If you purchased your processor directly from miniDSP, your software will be available from the User Downloads
section of the miniDSP website when your order ships. To access the download, you will need to be logged into
the website with the account you created when purchasing.
If you purchased your processor from a miniDSP dealer, you will receive a coupon together with the product.
Redeem this coupon at the link below:
•https://www.minidsp.com/support/redeem-coupon
The User Downloads link is visible from the dropdown menu at the top right of the website:
Navigate to the Dirac Series section and then to DDRC-24 Software. Download the zip file under the heading
DDRC-24 software for Dirac 2.0.
After downloading, unzip the file (double-click on it). The unzipped download has a name like
DDRC_24_v1_10_Dirac2. (The version numbers embedded in the folder name may be different.)

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3.2.3 Install the miniDSP software
3.2.3.1 Possible Mac installation issues
If double-clicking on the installer brings up a message that the installer cannot run, use this alternate method:
1. Right-click on the installer (or click while holding the Control key).
2. Move the mouse over the “Open With” item and then click on “Installer (default).”
3. The following window will appear. Click on “Open.”
3.2.3.2 Install the plugin
3. Navigate to the Plugins folder of the software download and then to the Mac folder.
4. The installer is named DDRC-24.pkg. To run it, double-click on it, or right-click and open as described
above. We recommend that you accept the default installation settings.
5. To run the plugin, locate it in the Applications -> miniDSP folder and double-click on it. To make it easier to
run in future, right-click on its dock icon and select Options -> Keep in Dock.
3.2.3.3 Enable file sharing for device discovery
To enable device discovery, open System Preferences, go to Sharing, then
enable File Sharing as shown at right.
Notes:
a) This step is not always necessary and may depend on your Mac’s
configuration or your home network setup.
b) If you wish, you can turn File Sharing off again after completing your
Dirac Live calibration.

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3.3 2X4HD TO DDRC-24 UPGRADE
If you have purchased an upgrade to convert a miniDSP 2x4 HD to a DDRC-24, follow the steps below. (If you
purchased a DDRC-24, you do not need to do anything on this page.)
6. Update the firmware to the DDRC-24 version. The procedure is described in Firmware upgrade starting on
page 45. You must use the firmware file included in the DDRC-24 software download, in the
XMOS_Firmware folder. It will have a name like DDRC-24_XMOS_v1.11.bin (the version number “v1.11”
may change).
7. Power-cycle the hardware unit: remove power, wait a few seconds, and then reconnect power.
8. Start the DDRC-24 plugin. Click the Connect button (towards the top right).
9. The following screen will appear:
10. Click on the button “Copy Activation Code to Clipboard.”
11. Send an email message to [email protected] with the Subject line “DDRC-24 Activation Request.” In the
body of the email message, paste the activation code from the above step.
12. miniDSP will respond in normal (Hong Kong) working hours with an activation key file (.txt file). (Please
note that this is not an automated process.) This file contains a key text string consisting of 128 pairs of
letters separated by spaces (total 256 letters). Save this file to disk.
13. Click the “Import” button and select the received activation key file to import into the plugin. If successful,
you will then see a connection dialog box similar to the one on page 17. Click on “Reset ALL to defaults.”
14. The Connect button will change as shown:

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4CONFIGURING WITH THE DDRC-24 PLUGIN
The DDRC-24 processor is configured with the DDRC-24 plugin / user interface program. Configuration of the
DDRC-24 using the plugin must be done prior to performing Dirac Live calibration. This section provides a
summary of the plugin and how to use it.
During initial configuration of the processor, it is strongly recommended that any connected
amplification be powered off.
Upon starting the plugin, it brings up a screen with various controls and a main configuration area:
This section describes the key features of the plugin and provides an application-specific guide to configuring it.
For detailed information about each of the plugin’s features, see Section 8.

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4.1 SYNCHRONIZING WITH THE PROCESSOR
Connect the DDRC-24 to a USB 2.0 port on your computer. Then click on the Connect button:
If successful, the button changes to a green tick as shown above. For the sake of brevity, this state is referred to
as “online” whereas the earlier state with the circular arrows is referred to as “offline.” When the plugin is
online, any changes made in the DDRC-24 plugin are immediately transferred to the DDRC-24 and will be heard
in the audio signal.
The first time you connect, or if you have made any changes to any data in the plugin, a dialog box will appear:
Restore ALL to default
This option will appear the very first time you connect. It is strongly recommended that you select this
option the first time. After restoring all data to defaults, the plugin is online.
Synchronize Config
Download the data for the currently selected configuration into the DDRC-24. Note that this applies only
to data that can be changed in the DDRC-24 plugin —Dirac Live filters are not changed by doing this. After
downloading the configuration data, the plugin is online.
Synchronize and Upgrade
This is similar to Synchronize Config, but also upgrades the internal data of the processor. This option may
appear after downloading and installing an updated version of the plugin.
Restore Config
Restore the data in the currently selected configuration to the factory defaults. Note that this applies only
to data that can be changed in the DDRC-24 plugin —Dirac Live filters are not changed by doing this.
When using this option, any connected equipment should be muted or powered off until you have set the
configuration to a working state. Configuration data will be lost, so if needed, ensure that you have saved
the configuration to a file prior to using this option. After restoring, the plugin is online.
Help
This option brings up a help screen explaining the options.
Cancel
This option cancels the attempt to connect to the processor. The plugin will remain offline.

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4.2 KEY FEATURES
This section summarizes the key features of the plugin. For detailed information, see Section 8.
4.2.1 Master control
Once the plugin is online, the items in the Master Control area are active. The Mute button disables all audio
output:
The Master Volume display shows the current volume setting. The master volume can be set directly by clicking
here and typing a new value. It can also be set with a remote control:
The Start Dirac Live Software button starts the separate DiracLive application. When this button is pressed, the
DDRC-24 plugin will disconnect from the DDRC-24 processor and then start up DiracLive.
You must start the DiracLive application from within the DDRC-24 plugin using the Start Dirac Live
Software button. If you open the DiracLive application by itself, it will not be able to detect the
DDRC-24 processor.
The Dirac Live button turns Dirac Live processing on and off. This function can also be accessed with a remote
control and from within the DiracLive app:
The IP Address and Auto fields are for use with networked control of the plugin using the miniDSP WI-DG
Wifi/Ethernet to USB bridge. See the Wi-DG User Manual for details.

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4.2.2 Configuration/preset selection
The set of data that controls the back-end processing is called a configuration. This includes crossovers,
parametric EQ and the routing matrix. It does not include the master volume or mute status.
Four configurations are stored onboard. The currently selected preset is indicated by a dark background:
To switch to a different preset, just click on the desired button:
4.2.3 Inputs
The Routing tab displays two input channel status strips. Note that these are status only –there are no user-
adjustable controls. They are active only when the plugin is online. For more information, see page 31.
4.2.4 Input selection
When the plugin is online, the currently selected input appears next to the “Dirac Inputs” label. Click on the
current input name to drop down a selector menu, from which you can select a different input. The input can
also be selected with a remote control –see page 28.

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4.2.5 Matrix mixer
The matrix mixer on the Routing tab directs input channels (along the left) to output channels (along the top). To
turn on routing for a cross point, click on that cross point. Both inputs can be mixed to each output if desired,
and the mix level can be set individually for each input. For more information, see page 31.
4.2.6 Outputs
The Outputstab displays a row of four output channel control strips. All output channels are identical.
Each channel has an individual gain adjustment slider, and a graphical and numerical display of the current signal
level on that channel.
A comprehensive set of signal processing functions is accessed with the buttons PEQ, Xover, and Comp. Each
channel also has individual invert and mute controls, and a signal delay of up to 30 ms. These are described in
detail in Section 8.